EVALUATION OF PUMPING POWER-CONSUMPTION I N DISTRICT-HEATING AND COOLING SYSTEM WITH DRAG-REDUCING CATIONIC SURFACTANTS, AND DISCUSSIONS ONTHE PRACTICAL APPLICATION OF SURFACTANT DRAG REDUCTION

The addition of cationic surfactant causes significant drag reduction in a fluid transport line of a district heating and cooling system. Th e scale up data for a fluid transport system with a well known effecti ve additive were obtained in this study, Also, a simplified calculatin g method to predict the power consumption in the surfactant drag reduc ing system was proposed. Many aspects of the practical problems which are encountered in the application of surfactant drag reduction techno logy were experimentally discussed and it was certified that the addit ion of surfactants to the practical district heating and cooling syste m caused no problem.